Cement mixer



NOV. 2, w, BONNEY ET AL 2,452,896

v CEMENT MIXER Filed Sept. 1, 1945 2 Shets-Sheet 1 INVENTORS .hpmer U/LBonney BY Mablon .Bonney HTTYS H. W. BONNEY ET AL Nov. 2, 19%8.

CEMENT MIXER 2 Sheets-Sheet 2 Filed Sept. 1, 1945 VIII/47911!!! INVENTORS Jzfomer LU. Bonney BY Mala/0n Bonneg Patented Nov. 2 1948 CEMENT MIXER Homer W. Bonney and Mahlon Bonney, Roseville, Calif.

Application September 1, 1945, Serial No. 613,988

This invention is directed to, and it is an ob; ject to provide an improved relatively light weight and portable cement mixer; the mixer being readidly demountable for transport from place to place.

Another object of the invention is to provide a cement mixer which includes an electric drive mechanism arranged in unitary assembly with the mixing drum; said assembly being demountable from the remainder of the structure without disconnecting or in any way disturbing said drive mechanism.

A further object of the invention is to provide a cement mixer, as in the preceding paragraph, which includes an electric motor and a novel driving arrangement between said motor and the mixing drum.

An additional object of the invention is to provide a cement mixer wherein said mixing drum and drive mechanism assembly are mounted on a swivel base whereby to facilitate loading or unloading of said drum; said assembly being manually tiltable between a drum position normally upwardly inclined toward its open end for loading, and a downwardly inclined position for unloading.

A further object of the invention is to provide a simple and inexpensive device, and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Figure 1 is a side elevation of the improved cement mixer in loading position.

Figure 2 is a plan view of the cement mixer.

Figure 3 is a front elevation of the mixer detached from the pedestal.

Figure 4 is a fragmentary cross section showing the rotary mount for the mixing drum.

Referring now more particularly to the characters of reference on the drawings, the improved cement mixer comprises a pedestal l which includes a vertical tubular standard 2. A vertical post 3 is seated in the tubular standard 4 Claims. (Cl. 259-177) 2 in rotatable relation, but is normally prevented from escape from said standard by means of a radial locking or retaining pin 4 which'projects through the standard and rides in an annular groove 5 formed in said post 3.

At its upper end the post 3 is fitted with an upwardly opening yoke 6 of rigid construction.

A cement mixing drum 1 is straddled from below and adjacent but short of its closed rear end by the yoke 6; said mixing drum being of taper type and normally extending at an upward incline towards its open outer or discharge end. Within the drum 1 it is provided with a plurality of circumferentially spaced mixing baffles 8.

The mixing drum 1 is demountably and tiltablysupported from the yoke 6 as follows:

At its rear end and centrally thereof the mixing drum is fitted with an axial hub 9 which includes an annular, radially extending flange I0 afiixed to said rear end of the mixing drum by a plurality of circumferentially spaced bolts ll. The hub 9 is mounted on a heavy-duty spindle l2 which projects into a bearing sleeve l3 fixed in connection with a horizontal cross beam l4. Escape of the hub 9 from the spindle I2 is prevented by means of a head [5 on said spindle.

It will thus be seen that the mixing drum 1 is suspended or mounted in its entirety by means of the hub and spindle arrangement above described.

At opposite ends the cross beam I4 is provided with rigid, forwardly projecting supporting arms l6 which include, at their free ends, inwardly projecting trunnions I 7 which removably seat in saddles l8 formed in the upper ends of the legs of yoke 6. The cross beam I 4 and the supporting arms 6 form, in effect, a frame structure. A generally V-shaped leg I9 is fixed on the under side of the cross beam l4 and depends at a downward inclination toward and into normal engagement with the post 3 below the yoke 6; such leg l9 thus serving as stop means to limit upward swinging movement of the mixing drum at its forward end, and in which direction the drum normally tends to swing on account of the weight of the driving mechanism, as hereinafter described,

The driving mechanism for the mixing drum 1 comprises the following:

A platform 28 is fixed in connection with and projects rearwardly from the cross beam [4 adjacent one end of the latter, and an electric motor 2! is mounted on said platform to the rear of the cross beam M, with the motor shaft 22 projecting forwardly. A pulley 23 on shaft 22 drives a transversely extending, endless belt M, which in turn drives a pulley 25 on a countershaft 26 'journaled through the cross beam l4 adjacent the end opposite the motor 2|. The countershaft 26 is fitted, ahead of the cross beam, with a pinion 27, which in turn meshes with and drives a relatively large-diameter main gear 28 formed as an integral part of the flange I0. With actuation of the motor 2| a relatively slow-speed but positive drive is thus imparted to the mixing drum 1.

By reason of the described driving mechanism .it will be evident that the mixing drum 1, to-

prising the mixing drum 1 and the driving mechanism when the cement mixer is in use, there is provided a rear handle 29 which extends bai1- like rearwardly from the cross beam 54 about the motor 2! and the adjacent parts of the driving mechanism. The rear handle 29 thus also serves as a guard for the motor and said parts of the driving mechanism. There is also provided a generally V-shaped front handle 32 which extends from the forward ends of the supporting arms 50 at a forward and upward incline in clearance relation over the mixing drum '1; said front handle terminating at the top-adjacent the open or discharge end of the mixing drum 1.

When the described cement mixer is in use, 3a

its normal position is as shown in Fig. 1. With the motor 2] running, the mixing drum 1 is rotated andthe parts of the mix are fed into said drum 'through'its then uppermost open forward end. -When the mixture is complete the assembly of the mixing drum '1 and the driving mechanism is tilted in a direction to lower the open end of said drum, whereby to discharge the mix into a mix-transporting wheel-barrow or the like.

The above tilting can be accomplished either by manipulating the rear handle 29 or the front handle 30, whichever is most convenient to the operator. In addition, the swivel mounting of the post 3 facilitates both loading and unloading of the mixer, as the operator can swing the drum '1 to the most convenient position.

From the foregoing description it will be readily seen that there has been produced such a device as will substantially fulfill the objects of the-invention, as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device,wstill in practice such deviations therefrom may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described the invention, the following is claimed as new and useful and upon which Letters Patent are desired:

1. A cement mixer comprising a pedestal including a vertical tubular standard, a vertical post seated in the standard and turnable therein about a vertical axis, an upwardly opening yoke on the upper end of the post, a mixing drum-extendin through the yoke, a frame structure on which the drum is journaled, means mounting the frame structure on the yoke for independent vertical tilting of the drum on a horizontal axis between loading and discharging positions at any point to which the yoke may be turned about such ver tical axis, and drive means mounted in unitary relation on the frame structure and connected in driving relation to the drum.

2. A cement mixer comprising a pedestal iii-j eluding a vertical tubular standard, a vertical post seated in the standard and turnable therein about a vertical axis, an upwardly opening yoke on the upper end of the post, a mixing drum extending through the yoke, a frame structure on which the drum is journaled, means mounting the frame structure on the yoke for independent vertical tilting of the drum on a horizontal axis between loading and discharging positions at any point to which the yoke may be turned about such vertical axis, and drive means mounted in --uni-tary relation on the frame structure and connected in driving relation to the drum; the

,-. frame structure being demountable from the yoke.

3. A cement mixer comprising a pedestal including a vertical tubular standard, a vertical post seated in the standard and turnable therein about a vertical axis, an upwardly opening yoke on the upper end of the post; a mixing drum extending through the yoke, a frame structure on which the :drum is journaled, means mounting the frame structure on the yoke for independent 4 vertical tilting of the drum on a horizontal axis between loading and discharging positions at any point to which the yoke may be turned about such vertical axis, and drive means mounted in unitary relation on the frame structure and connected in driving relation to the drum; the frame structure being demountable from the yoke, and the post being removable from the standard.

4. A cement mixer comprising an upstanding tubular standard, a post turnablein the standard, a substantially U-shaped yoke on the post, an open ended saddle on the upper-end of each arm of the yoke, a cross beam, a supporting arm projecting from each end of the cross beam, an inwardly projecting trunnion at the outer end of each arm, each trunnion resting in one of said saddles, a mixing drum.mounted for rotation on the cross beam and projecting-forwardly between the arms of the yoke, power drive-means mounted on the cross beam and connected in driving relation with the drum, the drive means being so disposed relative to the trunnions that the weight thereof will normallytilt the forward end of the drum upward about said trunnions as an axis, and'a leg fixed to the cross beam .and in contact with the post to limit such tilting movement.

HOMER W. BONNEY. MAHLON BONNEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,321,082 Bergland Nov. 11, 1919 1,621,345 Anderson Mar. 15, 1927 2,176,874 St. John Oct. 24, 1939 FOREIGN PATENTS Number Country Date 118,510 Australia Mar. 18,1943 125,904 Australia Dec. 28, 1931 355,850 Great Britain Sept. .3, 1931 

